/*******************************************************************************
 * This file is part of blueprint4j www.blueprint4j.org.
 * 
 *     blueprint4j is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     blueprint4j is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Lesser General Public License for more details.
 * 
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with blueprint4j. If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package blueprint4j.db;

import blueprint4j.utils.*;

import java.sql.*;
import java.util.*;

public class FieldEnumeration implements Enumeration {
	private ResultSet rs;
	private String field;
	
	boolean next=true;
	Object object=null;
	
	public FieldEnumeration(ResultSet rs,String field){
		this.rs=rs;
		this.field=field;
		nextResult();
	}
	
	private void nextResult(){
		try {
			next=rs.next();
		} catch (Exception e){
			Log.debug.out(e);
		}
		if (next){
			try {
				object=rs.getObject(field);
			} catch (Exception e){
				Log.critical.out(e);
				System.exit(-1);
			}
		}else{
			object=null;
		}
	}
	
	public boolean hasMoreElements() {
		return next;
	}

	public Object nextElement()
	throws NoSuchElementException {
		Object ret=object;
		nextResult();
		return ret;
	}

	public Vector getVector()
	throws NoSuchElementException {
		Vector vector=new Vector();
		while (hasMoreElements()){
			vector.add(nextElement());
		}
		return vector;
	}
}
